.fade-enter-from,
.fade-leave-to {
  /*定义进入开始和离开结束的透明度为0*/
  opacity: 0;
}

.fade-leave-to {
  transform: translateX(20px);
}
.fade-enter-to {
  transform: translateX(0px);
}

.fade-enter-to,
.fade-leave-from {
  /*定义进入结束和离开开始的透明度为1*/
  opacity: 1;
}
.fade-leave-active,
.fade-enter-active {
  transition: all 0.4s ease-out;
}